8.4.2. The KSM Tuning Service

systemctl start ksmtuned

# systemctl start ksmtuned
Starting ksmtuned:                                         [  OK  ]

Configuration file for ksmtuned.
How long ksmtuned should sleep between tuning adjustments
KSM_MONITOR_INTERVAL=60
Millisecond sleep between ksm scans for 16Gb server.
Smaller servers sleep more, bigger sleep less.
KSM_SLEEP_MSEC=10
KSM_NPAGES_BOOST - is added to the `npages` value, when `free memory` is less than `thres`.
KSM_NPAGES_BOOST=300
KSM_NPAGES_DECAY - is the value given is subtracted to the `npages` value, when `free memory` is greater than `thres`.
KSM_NPAGES_DECAY=-50
KSM_NPAGES_MIN - is the lower limit for the `npages` value.
KSM_NPAGES_MIN=64
KSM_NPAGES_MAX - is the upper limit for the `npages` value.
KSM_NPAGES_MAX=1250
KSM_THRES_COEF - is the RAM percentage to be calculated in parameter `thres`.
KSM_THRES_COEF=20
KSM_THRES_CONST - If this is a low memory system, and the `thres` value is less than `KSM_THRES_CONST`, then reset `thres` value to `KSM_THRES_CONST` value.
KSM_THRES_CONST=2048
uncomment the following to enable ksmtuned debug information
LOGFILE=/var/log/ksmtuned
DEBUG=1

# Configuration file for ksmtuned.
# How long ksmtuned should sleep between tuning adjustments
# KSM_MONITOR_INTERVAL=60

# Millisecond sleep between ksm scans for 16Gb server.
# Smaller servers sleep more, bigger sleep less.
# KSM_SLEEP_MSEC=10

# KSM_NPAGES_BOOST - is added to the `npages` value, when `free memory` is less than `thres`.
# KSM_NPAGES_BOOST=300

# KSM_NPAGES_DECAY - is the value given is subtracted to the `npages` value, when `free memory` is greater than `thres`.
# KSM_NPAGES_DECAY=-50

# KSM_NPAGES_MIN - is the lower limit for the `npages` value.
# KSM_NPAGES_MIN=64

# KSM_NPAGES_MAX - is the upper limit for the `npages` value.
# KSM_NPAGES_MAX=1250

# KSM_THRES_COEF - is the RAM percentage to be calculated in parameter `thres`.
# KSM_THRES_COEF=20

# KSM_THRES_CONST - If this is a low memory system, and the `thres` value is less than `KSM_THRES_CONST`, then reset `thres` value to `KSM_THRES_CONST` value.
# KSM_THRES_CONST=2048

# uncomment the following to enable ksmtuned debug information
# LOGFILE=/var/log/ksmtuned
# DEBUG=1